Austria-Hungary, also referred to as the Austro-Hungarian Empire and officially as the Austro-Hungarian Monarchy, was a multi-national constitutional dual empire in Central Europe between 1867 and 1918. A military and diplomatic alliance, it consisted of two sovereign states with a single monarch who was titled both the Emperor of Austria and the Apostolic King of Hungary. Austria-Hungary constituted the last phase in the constitutional evolution of the Habsburg monarchy: it was formed with the …